Bilinearity rank of the cone of positive polynomials and related cones

Rudolf, Gabor and Noyan, Nilay and Papp, David and Alizadeh, Farid (2010) Bilinearity rank of the cone of positive polynomials and related cones. (Accepted/In Press)

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For a proper cone K ⊂ Rn and its dual cone K the complementary slackness condition xT s = 0 defines an n-dimensional manifold C(K) in the space { (x, s) | x ∈ K, s ∈ K^* }. When K is a symmetric cone, this manifold can be described by a set of n bilinear equalities. When K is a symmetric cone, this fact translates to a set of n linearly independent bilinear identities (optimality conditions) satisfied by every (x, s) ∈ C(K). This proves to be very useful when optimizing over such cones, therefore it is natural to look for similar optimality conditions for non-symmetric cones. In this paper we define the bilinearity rank of a cone, which is the number of linearly independent bilinear identities valid for the cone, and describe a linear algebraic technique to bound this quantity. We examine several well-known cones, in particular the cone of positive polynomials P2n+1 and its dual, the closure of the moment cone M2n+1, and compute their bilinearity ranks. We show that there are exactly four linearly independent bilinear identities which hold for all (x,s) ∈ C(P2n+1), regardless of the dimension of the cones. For nonnegative polynomials over an interval or half-line there are only two linearly independent bilinear identities. These results are extended to trigonometric and exponential polynomials.

Item Type:Article
Uncontrolled Keywords:Optimality conditions, positive polynomials, complementarity slackness, bilinearity rank, bilinear cones
Subjects:Q Science > Q Science (General)
ID Code:14714
Deposited By:Nilay Noyan
Deposited On:13 Oct 2010 10:17
Last Modified:20 Oct 2011 14:33

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